Method of manufacturing composite lumber



4 June 8,1926. 1,588,056

- ,7 5.; c. ROCKWELL mm or umbmc'runme cowosrrg: wuaan Filed-Feb. 7. 1923 f Jam; 5790 C. Far/W544.

rangement.

Patented June 8, 1926.

UNITED, STATES PATENT OFFICE.

BYRD C. ROCKWELL, OF OAMDEN, ARKANSAS.

I METHOD OF MANUFACTURING COMPOSITE LUMBER.

' Application filed February 7, 1923. Serial No; 617,566.

posite lumber possessing these characteris-.

tics, and my present invention relates more particularly to economical method of producing a strip such as is contemplated in mybefore mentioned patent.

In the drawings- Figure 1 is a view illustrating the strips of lumber as first assembled in position.

Figure 2 is a view illustrating one method of finishing one of the severed strlps.

Figure 3 is a view illustrating one method of working up the wedge-shaped slab.

Figure 4 is a view illustrating another method of working up the wedge-shaped slabs.

Figure 5 is a modified form of strip ar- In Figure 1 of the drawing are illustrated three strips of lumber, the central strip A being preferably clear hardwood or soft wood, such as pine, depending upon the kind of finish and facing strip desired. B repre-' sents a strip of low grade lumber, such as sap gum, etc, there being one of the strips B arranged on each side of the strip A.

Strips B, A and B are cemented or glued together preferably by the use of a water proof compound. In practice these strips are usually held under pressure until the cement or glue is dry.

By virtue of the fact that the central strip A has the cement or glue applied to its opposite faces, there is no tendency of the strips to unequally shrink or warp away from each other.

After the strips are assembled, as shown in Figure 1, they are sawed along the dotted lines a producing two faced strlps, such as indicated in Figure 2, in which both the;

high grade facing and the low grade backi.

' 1ng composite lumber consisting of unltmg ing are firmly glued together, there being left one clear edge of each; These strlps, as shown in 'Figure 2, by virtue of the obliqueness of the saw cuts a may have thelr facing edges square, as indicated by the dotted lines I) in Figure 1, which represent either a saw enter the removal of this ma; terial by. planing knives. I

The composite strip as-shown in Figure 2 can have the clear edge of its finishing face formed with a molding, as forinstance when used as a baseboard, and the coreof the low grade backing strip may be cutaway for the purpose of leaving edge contacting'surfaces, as indicated, by the dotted lines a and (Z, respectively.

Figure 3 illustrates one of the wedge shaped slabs removed when the saw cutsa are made. These slabs may be re sawed, as indicated in dotted lines 6, to make strips which can be worked up as slats for crates,

or for other purposes; or, said wedge shaped strips, which I have designatedat B may be apphed on opposite sides of a finishing strip A, as shown 1n F gure 4 belng secured to said finishing strip by cement or glue, as mentloned 1n connectlon with the assemblage of the parts shown in Figure 1.

After the strips B are securely attached to the strip A, strip A is severed diagonally by a saw out indicated by the dotted line f and the edges may be finished by planing or sawing, as represented by the dotted lines 9. I f v Gomposite stripsof lumber produced by my improved method can be economically produced in large quantities and possess all of the advantages ofthe strip disclosed in my before mentioned patent.

While I have shown an assemblage of three strips in Figure 1, it is obvious that a greater number of strips may be assembled, as shown in Figure 5 in which strips A alternate with strips B, the latter being preferably the exposed strips at opposite sides of the pile, although this arrangement may, of course, be reversed. 1

What I claim is:

1.,The herein described method of pro a plurality of strips of different grades of lumber, and then diagonally severing the united strips, each line of severance occurring within an individual strip.

8. The herein described method of produoing composite lumber consisting in uniting a plurality of strips of dififerent grades, thensevering said strips so that the uniting line Will extend diagonally across the severed strip.

4. The herein described method of producing composite lU'HllJGI consisting in uniting a plurality of strips of difierent grades and then severing said united strips so as to leave a clear edge of the united strips on opposite sides of the severed strip.

5. The herein described method of producing composite lumber consisting in unit ing a plurality of strips of different grades and then sawing each strip diagonally so to produce a severed composite strip com--.

prising a portion of two united strips having their meeting line disposed diagonally relative to said composite strip.

In testimony whereof I hereunto aiiiX my signature this 28th day of December, 1922. BYRD C. ROCKWELL. 

